Business models for Open Educational Resources: how to exploit OER after a funded project?

Open Educational Resources (OER) projects often face the challenge of how to sustain and develop further the resources after the initial project funding comes to an end. OER are provided for free and open for anybody to re-use, modify and distribute. How than can the producers exploit the resources, are there any feasible business models, especially models which could remove or at least reduce dependence on limited and insecure funding? This article presents results of a survey of literature on OER business models and an overview of models identified in the literature. For projects which developed a learning program with OER the freemium model is being considered as a promising model.